US6458332B2 - Crystallization apparatus and crystallization method - Google Patents

Crystallization apparatus and crystallization method Download PDF

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US6458332B2
US6458332B2 US09/801,747 US80174701A US6458332B2 US 6458332 B2 US6458332 B2 US 6458332B2 US 80174701 A US80174701 A US 80174701A US 6458332 B2 US6458332 B2 US 6458332B2
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liquid
crystallization apparatus
slurry
temperature difference
temperature
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US20010011520A1 (en
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Hiroshi Ooshima
Hideo Noda
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Kansai Chemical Engineering Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D9/00—Crystallisation
    • B01D9/02—Crystallisation from solutions
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D9/00—Crystallisation
    • B01D9/0004—Crystallisation cooling by heat exchange
    • B01D9/0013—Crystallisation cooling by heat exchange by indirect heat exchange
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/05—Stirrers
    • B01F27/07—Stirrers characterised by their mounting on the shaft
    • B01F27/072—Stirrers characterised by their mounting on the shaft characterised by the disposition of the stirrers with respect to the rotating axis
    • B01F27/0727—Stirrers characterised by their mounting on the shaft characterised by the disposition of the stirrers with respect to the rotating axis having stirring elements connected to the stirrer shaft each by two or more radial rods, e.g. the shaft being interrupted between the rods, or of crankshaft type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D9/00—Crystallisation
    • B01D9/0018—Evaporation of components of the mixture to be separated
    • B01D9/0031—Evaporation of components of the mixture to be separated by heating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/05—Stirrers
    • B01F27/11—Stirrers characterised by the configuration of the stirrers
    • B01F27/19—Stirrers with two or more mixing elements mounted in sequence on the same axis
    • B01F27/192—Stirrers with two or more mixing elements mounted in sequence on the same axis with dissimilar elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/80—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/90—Heating or cooling systems
    • B01F35/92—Heating or cooling systems for heating the outside of the receptacle, e.g. heated jackets or burners
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T117/00—Single-crystal, oriented-crystal, and epitaxy growth processes; non-coating apparatus therefor
    • Y10T117/10—Apparatus

Definitions

  • the present invention relates to a crystallization apparatus and a crystallization method. More specifically, the present invention relates to a crystallization apparatus which enables an induction time for crystallization to be shorter, and can provide large crystals with a narrow size distribution, as well as to a method for obtaining such crystals. Furthermore, the present invention relates to a method for controlling crystal polymorphism.
  • One known method for crystallization is to raise the concentration of the solution by evaporating the solvent.
  • the concentration of the material to be crystallized in the solution increases, the evaporation rate of the solvent decreases, so that there is a disadvantage that the crystallization gradually slows down, and the distribution of the diameters of the obtained crystals becomes broad.
  • the solvent has to be evaporated over a long period of time.
  • a substance can take various crystal forms, such as ⁇ -crystals, ⁇ -crystals, and ⁇ -crystals, and the solubility of the substance varies depending on the crystal form.
  • it is important to make a crystal form uniform since uniform solubility of the pharmaceuticals can be obtained by a specified crystal form.
  • it is difficult to attain a specified crystal form that is, to control crystal polymorphism
  • a crystallization apparatus in accordance with the present invention includes an agitation tank, a liquid circulation means for circulating a liquid or a slurry along a wall of the agitation tank, and one or more temperature difference creation means capable of creating a temperature difference at the wall of the agitation tank, wherein the temperature difference creation means is installed to the agitation tank.
  • Another crystallization apparatus in accordance with the present invention includes an agitation tank provided with a liquid spouting device made of a rotation shaft and one or more liquid feeding means mounted to the rotation shaft, and one or more temperature difference creation means capable of creating a temperature difference at a wall of the agitation tank.
  • the temperature difference creation means is one or more heating means or cooling means.
  • the temperature difference creation means is a heating means, which is provided at a region where liquid or slurry spouted by rotating the liquid spouting device contacts the wall of the agitation tank or a region below that region, and which increases the temperature of the spouted liquid or slurry above the temperature of surrounding liquid or slurry.
  • the temperature difference creation means is a cooling means, which is provided at a region where liquid or slurry spouted by rotating the liquid spouting device contacts the wall of the agitation tank or a region below that region, and which decreases the temperature of the spouted liquid or slurry above the temperature of surrounding liquid or slurry.
  • the temperature difference creation means includes two cooling means and one heating means, the heating means is arranged below the two cooling means, and a liquid or slurry is spouted against a portion between the two cooling means or against a portion of the lower cooling means by rotating the liquid spouting device.
  • the liquid feeding means is a gutter-shaped body, a pipe body, a plate-shaped body, or a conically shaped hollow truncated corn body.
  • the crystallization apparatus is a cooling crystallization apparatus.
  • the crystallization apparatus is a concentration crystallization apparatus.
  • a method for controlling crystal polymorphism in accordance with the present invention comprises concentrating a liquid for generating crystals while circulating the liquid along a tank wall provided with a temperature difference.
  • Another method for controlling crystal polymorphism comprises spouting a liquid or a slurry from a liquid spouting device containing a rotation shaft and one or more liquid feeding means mounted to the rotation shaft, and contacting the spouted liquid or slurry with a tank wall whose temperature is different from the temperature of the liquid or slurry and circulating the liquid or slurry.
  • the spouted liquid or slurry is contacted with a tank wall whose temperature is higher than the temperature of the liquid or slurry.
  • the spouted liquid or slurry is contacted with a tank wall whose temperature is lower than the temperature of the liquid or slurry.
  • a method for growing crystals with large average diameter in accordance with the present invention comprises spouting a liquid or a slurry from a liquid spouting device containing a rotation shaft and one or more liquid feeding means mounted to the rotation shaft, and contacting the spouted liquid or slurry with a tank wall whose temperature is different from the temperature of the liquid or slurry and circulating the liquid or slurry.
  • FIG. 1 shows an example of a crystallization apparatus in accordance with the present invention.
  • FIG. 2 shows an example of a liquid spouting device installed with a gutter-shaped body as a liquid feeding means.
  • FIG. 3 shows another embodiment of a crystallization apparatus in accordance with the present invention.
  • FIG. 4 is a graph illustrating the crystallization rate of L-aspartic acid using a crystallization apparatus of the present invention and using a conventional apparatus.
  • FIG. 5 is a graph illustrating the size distribution of the crystals of L-aspartic acid obtained with the crystallization apparatus of the present invention and with the conventional crystallization apparatus.
  • FIG. 6 shows photographs showing crystal forms existed as the crystallization proceeds.
  • FIG. 7 is a graph illustrating the temporal change of the crystal form.
  • FIG. 8 is a graph illustrating the temporal change of the concentration of L-glutamic acid.
  • FIG. 9 is a graph illustrating the temporal change of the average diameter of crystals of L-glutamic acid.
  • FIG. 10 shows graphs illustrating the average diameter distribution of crystals of L-glutamic acid at various times during the concentration.
  • FIG. 11 shows photographs showing crystals of terephthalic acid.
  • FIG. 11A shows crystals obtained with the apparatus of the present invention
  • FIG. 11B shows crystals obtained with a conventional apparatus.
  • the magnification of FIGS. 11A and B is 100-fold.
  • liquid refers to a liquid not containing crystals
  • slurry refers to a liquid containing crystals
  • liquid circulation means and “liquid spouting device” refer to a means for circulating and a device for spouting a liquid or a slurry, respectively.
  • a crystallization apparatus in accordance with the present invention includes an agitation tank, a liquid circulation means for circulating a liquid or a slurry along a tank wall of the agitation tank, and one or more temperature difference creation means capable of creating a temperature difference at the wall of the agitation tank, wherein the temperature difference creation means is installed to the agitation tank.
  • the most preferable embodiment of such a crystallization apparatus includes an agitation tank provided with a liquid spouting device including a rotation shaft and one or more liquid feeding means mounted to the rotation shaft, and one or more temperature difference creation means capable of creating a temperature difference at the wall of the agitation tank.
  • the crystallization apparatus of the present invention is characterized in that it has a liquid circulation means, such as a liquid spouting device, and that it can bring the liquid or slurry in contact with different temperatures (that is, a higher or lower temperature). Consequently, the crystallization apparatus of the present invention can use three variables: amount of circulation liquid, high temperature and low temperature.
  • a means which circulates the liquid or the slurry along the tank shape of the agitation tank, is preferable.
  • a means for lifting the liquid or slurry to an upper portion of the agitation tank by using a circulation pump and letting the liquid or slurry flow along the tank wall from the upper portion, a means for letting the liquid or slurry flow along the tank wall from the upper portion of the agitation tank with a spray nozzle or the like, and a means for spouting liquid or slurry against the tank wall.
  • a liquid spouting device that utilizes Bernoulli's theorem and/or centrifugal forces to pump the liquid or slurry up and spout it against the tank wall.
  • crystallization apparatus of the present invention using a liquid spouting device.
  • the crystallization apparatus of the present invention is not limited to examples using a liquid spouting device.
  • FIG. 1 shows a crystallization apparatus of the present invention.
  • a motor M to which a rotation shaft 3 is attached is mounted to an agitation tank T.
  • the liquid spouting device 4 is constituted by liquid feeding means 1 made of hollow pipes and attachment devices 2 , and is mounted to the rotation shaft 3 .
  • H and J are temperature difference creation means.
  • the temperature difference creation means H and J are set to produce a temperature difference. That is to say, the temperature of the temperature difference creation means H arranged at the upper portion of the agitation tank T may be set to a higher or to a lower temperature than the temperature of the temperature difference creation means J arranged at the lower portion of the agitation tank T.
  • Lower openings 11 of the liquid feeding means 1 are arranged underneath the liquid surface L, whereas upper openings 12 of the liquid feeding means 1 are arranged above the liquid surface L.
  • the liquid feeding means 1 are mounted at a certain inclination angle to the attachment devices 2 .
  • the liquid spouting device 4 rotates together with the rotation of the rotation shaft 3 , it takes up liquid or slurry from the lower openings 11 of the liquid feeding means 1 , moves the liquid or slurry through the liquid feeding means 1 , and spouts the liquid or slurry from the upper opening 12 , so that the spouted liquid is brought into contact with the temperature difference creation means H arranged at the upper portion of the agitation tank T.
  • the temperature of the spouted liquid or slurry becomes higher or lower than the surrounding temperature.
  • the temperature difference creation means H is a heating means, then fine crystals dissolve as the slurry passes through the heated region, and since the slurry flows back along the inner wall into the cooling tank, the heat transfer area of the lower portion can always be used completely, so that the cooling rate can be raised, the induction period for crystal generation is shortened, and crystals with narrow size distribution and large size are grown.
  • a crystallization apparatus is an example for a cooling crystallization apparatus.
  • the temperature difference creation means H is a cooling means
  • the crystallization in the slurry is accelerated as the slurry passes through the cooled region, and since the slurry flows back along the inner wall, the crystallization rate can be raised, the induction period for crystal generation is shortened, and crystals with narrow size distribution and large size are grown.
  • Such a crystallization apparatus is an example of a concentration crystallization apparatus.
  • the crystallization apparatus in FIG. 2 is also a crystallization apparatus as the one in FIG. 1 .
  • This crystallization apparatus is an example of a crystallization apparatus having a gutter-shaped body 5 as the liquid spouting device 4 .
  • the liquid or slurry is raised from lower openings 51 of the gutter-shaped bodies 5 , spouted from upper openings 52 and brought into contact with the heated or cooled region of the temperature difference creation means H.
  • the crystallization apparatus in FIG. 3 is an example of a crystallization apparatus, in which the liquid spouting device 4 is attached to an upper portion of the rotation shaft 3 , and agitation blades 6 are provided below the liquid spouting device 4 .
  • the liquid or slurry in this device is concentrated to a certain degree, the liquid is not spouted anymore, so that thereafter, the crystallization is performed by agitating.
  • the apparatus of the present invention can be used for both cooling crystallization and concentration crystallization. Since the apparatus of the present invention has a large evaporation area and a large heat transfer area, the induction period for crystallization is shortened, and large crystals with a narrow size distribution are obtained. Furthermore, it is possible to obtain a specified crystal form, that is, it is possible to control crystal polymorphism.
  • the liquid spouting device is explained by the example of the apparatus shown in FIG. 1 .
  • the liquid spouting device 4 is constituted by liquid feeding means 1 of hollow pipes and attachment devices 2 , and is mounted to the rotation shaft 3 .
  • Lower openings 11 of the liquid feeding means 1 are arranged underneath the liquid surface L, and upper openings 12 of the liquid feeding means 1 are above the liquid surface L.
  • the liquid feeding means 1 are mounted at a certain inclination angle to the attachment devices 2 .
  • liquid spouting device 4 When the liquid spouting device 4 rotates together with the rotation of the rotation shaft 3 , it takes up liquid or slurry from the lower openings 11 of the liquid feeding means 1 (for example, pipes), moves the liquid or slurry through the liquid feeding means 1 , and spouts the liquid or slurry from the upper openings 12 , so that the spouted liquid is brought into contact with the tank wall of the agitation tank T.
  • the liquid feeding means 1 for example, pipes
  • the position where the spouted liquid hits the tank wall of the agitation tank is changed by changing the mounting angle of the liquid feeding means 1 of the liquid spouting device 4 , by changing the number of rotation, or the like. Consequently, the angle at which the liquid feeding means 1 is attached to the liquid spouting device 4 and the number of rotation may be changed under consideration of the position of the temperature difference creation means discussed below.
  • liquid spouting device 4 shown in FIG. 1 is merely an example.
  • the device described in Japanese Laid-Open Patent Publication No. 6-335627 is used as the liquid spouting device 4 used in the crystallization apparatus of the present invention.
  • the shape of the liquid feeding means 1 attached to the liquid spouting device is a shape with which liquid or slurry can be moved by rotation of the rotation shaft 3 , in accordance with Bernoulli's theorem and/or centrifugal forces.
  • a gutter-shaped body, a plate-shaped body, a conically shaped hollow truncated corn body can be included.
  • the temperature difference creation means used in the apparatus of the present invention are set to produce a temperature difference. That is to say, the temperature of the temperature difference creation means arranged at the upper portion of the agitation tank may be set to a higher or to a lower temperature than the temperature of the temperature difference creation means arranged at the lower portion of the agitation tank. Which temperature is set to be higher may be decided depending on the desired crystal form (for example, ⁇ -crystal, ⁇ -crystal). Crystal polymorphism can be controlled by providing a temperature difference between the upper portion and the lower portion of the agitation tank.
  • the temperature difference creation means is provided at a region where the liquid spouted from the liquid spouting device contacts the tank wall of the agitation tank or at a region below this.
  • Examples of the temperature difference creation means include electrical heaters, electromagnetically induced heatings, heating coils, heating plates, or jackets in which a heating gas, vapor, heating medium, warm water, cooling water, brine and the like, can be circulated.
  • the temperature difference creation means may be provided on the outer side of the agitation tank, or on the inner side thereof. Furthermore, the temperature difference creation means may be provided in a shiftable manner.
  • heating coils, heating plates, cooling plates, and the like may be provided on the inner side of the tank wall of the agitation tank so as to hit the liquid spouted from the liquid spouting device against the heating coils, heating plates, cooling plates, and the like.
  • the temperature difference creation means is shiftable, because the position where the spouted liquid hits the tank wall is varied by changing the number of rotation of the liquid spouting device periodically or at random.
  • heating devices may be fixed so as to heat only desired regions, for example by computer control and the like.
  • the liquid or slurry is not spouted when the number of rotation of the liquid spouting device is reduced.
  • this portion functions as a condenser, which makes it easier to control crystal polymorphism.
  • a concentration crystallization apparatus (which will be explained below) to provide, for example, three temperature difference creation means, and to cool the upper and intermediate two and heat the lower one.
  • a concentration crystallization apparatus which will be explained below
  • the liquid spouted from the liquid spouting device does not contact the uppermost cooling portion but contacts the intermediate portion, there is the possibility that crystals are generated at this intermediate portion.
  • the upper portion can function as a condenser, the liquid condenses and there is a high possibility that the intermediate-cooling portion can be rinsed with a liquid of low concentration.
  • the liquid or slurry is not spouted, so that the crystals that have been generated at the intermediate cooling portion can be rinsed away with the liquid that has condensed at the upper cooling portion. Consequently, it is also preferable to provide three or more temperature difference creation means.
  • a cooling crystallization apparatus is explained with reference to FIG. 1 .
  • the temperature of the temperature difference creation means H (at an upper portion of the tank wall) is higher than the temperature of the temperature difference creation means J (at a lower portion of the tank wall). Therefore, it is preferable that the temperature difference creation means H is a heating means (for example, a heater or heating coil), and that the temperature difference creation means J (at a lower portion of the tank wall) is a cooling means (for example, a cooling jacket).
  • the slurry containing fine crystals generated by cooling is spouted against the upper portion of the agitation tank T, and as the slurry passes through the region that has been heated by the temperature difference creation means H (heating means), the fine crystals in the slurry are dissolved, and since the slurry flows back along the inner wall into the cooling tank, all the heat transfer area of the lower portion can always be used, so that the advantages obtained are that the cooling rate can be raised, the induction period for crystallization is shortened, and crystals with narrow size distribution and large size are grown.
  • the crystallization apparatus of the present invention can also be used as a concentration apparatus, if concentration of the liquid is necessary before making transition to cooling crystallization, it is possible to use the temperature difference creation means J (at a lower portion of the tank wall) as a heating means, to make the evaporation area and the heat transfer area large, to carry out the concentration fast, and to considerably shorten the time needed for the crystallization as a whole.
  • the temperature of the temperature difference creation means H (at an upper portion of the tank wall) is lower than the temperature of the temperature difference creation means J (at a lower portion of the tank wall). Therefore, it is preferable that the temperature difference creation means H is a cooling means (for example, a cooling jacket), and that the temperature difference creation means J (at a lower portion of the tank wall) is a heating means (for example, a heater or heating coil).
  • the slurry containing fine crystals generated by cooling is spouted against the upper portion of the agitation tank T, and as the slurry passes through the region that has been cooled by the temperature difference creation means H (cooling means), the crystallization in the slurry is accelerated, and since the slurry flows back along the inner wall, so that advantages obtained are that the crystallization rate can be raised, the induction period for crystal generation can be shortened, and large crystals with a narrow size distribution can be grown. For example, crystallizing glutamic acid by using this apparatus, it makes possible to selectively grow the metastable crystals, ⁇ -crystals.
  • the heated liquid can be spouted against the upper portion of the tank with the liquid spouting device, so that a large evaporation area can be obtained, which makes the evaporation of the liquid effective and makes it possible to obtain large crystals.
  • examples of methods for preventing crystals from adhering to the lower portion of the crystallization apparatus include to control the vacuum degree by temperature, if a solution evaporating in a vacuum is used, or to lower the temperature by the heat of vaporization. It is also possible to prevent crystals from adhering to the lower portion of the crystallization apparatus by circulating a cooled gas.
  • a crystallization apparatus in accordance with the present invention includes an agitation tank having a liquid circulation means for circulating a liquid or a slurry along the tank wall of the agitation tank, preferably a liquid spouting device made of a rotation shaft and one or more liquid feeding means mounted to the rotation shaft.
  • a liquid circulation means for circulating a liquid or a slurry along the tank wall of the agitation tank
  • a liquid spouting device made of a rotation shaft and one or more liquid feeding means mounted to the rotation shaft.
  • the spouted liquid or slurry contacts the temperature difference creation means provided at the tank wall of the agitation tank, and the temperature of the spouted liquid or slurry becomes higher or lower than the temperature of the surrounding liquid or slurry.
  • the temperature of the spouted liquid or slurry is made higher than the surrounding temperature with a heating means.
  • this liquid or slurry which includes fine crystals due to the cooling process, is heated and the fine crystals are dissolved when returning along the tank wall to the mother liquor, all the heat transfer area of the lower portion can always be used due to the spouting, so that the cooling rate can be raised.
  • the induction period for crystallization is shortened, and crystals with narrow size distribution and large size are grown.
  • the temperature of the spouted liquid or slurry is made lower than the surrounding temperature with a cooling means.
  • This not only makes it possible to make the evaporation area and the heat transfer area in the concentration process larger, but when a portion of the liquid or slurry containing fine crystals is returned along the tank wall to the mother liquor, it is cooled, so that advantages obtained are that the crystallization rate of the crystals in the liquid can be increased, which shortens the induction period for crystallization, and crystals with narrow size distribution and large size can be grown. For example, when crystallizing glutamic acid with this apparatus, ⁇ -crystals are particularly abundant.
  • the cooling crystallization of L-aspartic acid was carried out.
  • 1.5 L of L-aspartic acid solution at a concentration of 0.53% by weight (wt %) was placed into a crystallization apparatus having 139.8 mm inner diameter and a capacity of 3 L provided with a liquid spouting device having pipes as the liquid feeding means, as shown in FIG. 1 .
  • the cooling was initiated at a rotation speed of 340 rpm.
  • the temperature of the liquid in the apparatus was controlled to be 11.2° C.
  • a jacket was provided at the portion where the spouted liquid or slurry hit the agitation tank, and warm water of 30° C. was circulated through the jacket.
  • the temperature of the liquid or slurry in the crystallization apparatus was maintained at 11.2° C. (that is, a crystallization temperature of 11.2° C.), and the temperature of the cooling jacket was maintained at 5° C.
  • a crystallization apparatus with an agitation tank of similar shape but having only agitation blades and no liquid spouting device and no heating means was used (referred to as conventional apparatus A, in the following).
  • the temperature of the liquid or slurry in the conventional apparatus A was maintained at 11.2° C.
  • the results are shown in FIG. 4 .
  • the closed circles ( ⁇ ) in FIG. 4 illustrate the temporal change (crystallization rate) of the concentration of L-aspartic acid when the concentration was carried out with the crystallization apparatus of the present invention, and the open circles ( ⁇ ) when the concentration was carried out with the conventional apparatus A.
  • crystallization begins at about 6 hours after initiating the cooling, and this crystallization proceeds rapidly, and only about 17 hours were needed until the concentration of the L-aspartic acid decreased to about 3 mg/ml.
  • the crystallization began after about 20 hours, and about 38 hours were needed until the concentration of the L-aspartic acid decreased to about 3 mg/ml.
  • FIG. 5 is a graph showing the distributions of the size obtained with the apparatus of the present invention and the conventional apparatus, respectively.
  • the hatched columns indicate the crystals obtained with the apparatus of the present invention, and the open columns indicate the crystals obtained with the conventional apparatus A.
  • crystals of aspartic acid having large size could be obtained fast, in spite of no addition of seed crystals. It can be expected that when seed crystals are added, crystals of aspartic acid having even larger size can be obtained even faster.
  • the concentration crystallization of L-glutamic acid was carried out.
  • 2 liters of L-glutamic acid solution at a concentration of 50 g/L were placed into a crystallization apparatus having 139.8 mm inner diameter and a capacity of 3 L provided with a liquid spouting device having pipes as the liquid feeding means, as shown in FIG. 1 .
  • the cooling was initiated at a rotation speed of 290 rpm.
  • the temperature of the liquid or slurry in the crystallization apparatus was controlled to be 29.8° C. (that is, at a crystallization temperature of 29.8° C.).
  • a jacket was provided at the portion where the spouted liquid or slurry hit the agitation tank, and cooling water of 16° C. was circulated through the jacket.
  • the temperature of the liquid or slurry in the crystallization apparatus was maintained at 29.8 ° C., and the temperature of the warming jacket was 36.5° C.
  • FIG. 6 shows a comparison of the crystal form in the solution when using the crystallization apparatus of the present invention and the crystal form in the solution when using the conventional crystallization apparatus B.
  • FIGS. 6 (A) P.8h, 6 (C) P.12h, and 6 (E) P.16h are photographs showing the crystal form after 8, 12 and 16 hours when using the conventional apparatus B, respectively.
  • FIGS. 6 (B) P.W.W.8h, 6 (D) P.W.W.12h, and 6 (F) P.W.W.16h are photographs showing the crystal form after 8, 12 and 16 hours when using the crystallization apparatus of the present invention, respectively.
  • FIG. 7 illustrates the temporal change of the crystal form of L-glutamic acid in the crystallization.
  • the closed circles ( ⁇ ) in FIG. 7 illustrate the change of the crystal form when the concentration was carried out with the crystallization apparatus of the present invention, and the open circles ( ⁇ ) when the concentration was carried out with the conventional apparatus.
  • the proportion of ⁇ -crystals was determined with powder X-ray diffraction. It can be seen from FIG. 7, that only ⁇ -crystals are present for up to ten hours by using the crystallization apparatus of the present invention.
  • FIG. 8 illustrates the temporal change of the concentration of L-glutamic acid (crystallization rate).
  • the closed circles ( ⁇ ) illustrate the case when the concentration was carried out with the crystallization apparatus of the present invention, and the open circles ( ⁇ ) when the concentration was carried out with the conventional apparatus.
  • the solubility of ⁇ -crystals (16 mg/L) was reached somewhat faster by using the apparatus of the present invention. That is to say, it seems that, when using the apparatus of the present invention, the concentration of the solution decreases faster, so that the secondary nucleation is suppressed, and only ⁇ -crystals are generated.
  • the apparatus of the present invention is provided with a cooling means, a portion of the solution is cooled. Therefore, the saturation degree is raised, the nucleation of ⁇ -crystals in this portion is accelerated, and the crystals grow fast. It seems to be a reason for the fast crystallization.
  • FIG. 9 illustrates the average crystal diameter of the crystals of L-glutamic acid.
  • the closed circles ( ⁇ ) illustrate the case when the crystallization apparatus of the present invention was used, and the open circles ( ⁇ ) when the concentration was carried out with the conventional apparatus. It could be shown that the average crystal diameter become larger when using the crystallization apparatus of the present invention.
  • FIG. 10 illustrates the average crystal diameter distribution of the crystals of L-glutamic acid over time. It could be shown that the average crystal diameter of the crystals of L-glutamic acid was always larger when using the crystallization apparatus of the present invention (hatched columns in FIG. 10 ).
  • the crystallization of terephthalic acid was performed with the apparatus of FIG. 2.
  • 40 liters of ethylene glycol at 16 volume % by weight (W/V %) were placed into an agitation tank having a capacity of 100 liters and 400 mm internal diameter, to which the liquid spouting device shown in FIG. 2 was attached.
  • the initial temperature (at zero hours) of the upper temperature difference creation means H (upper jacket) was 100° C.
  • the temperature of the lower temperature difference creation means J (lower jacket) was 74° C.
  • the temperature of the upper jacket was maintained at 74° C. for four hours, and the temperature of the lower jacket was gradually lowered.
  • crystal precipitation had begun after three hours. After six hours, 1 liter each was taken for sampling from the crystallization apparatus of the present invention and from the conventional apparatus C, respectively. After these samples were allowed to stand for two hours, the precipitations were observed that the bulk density was about 40% (that is, solid portions accounted for the lower 40%) in the case of the apparatus of the present invention. On the other hand, the bulk density was about 80% (that is, solid portions accounted for the lower 80%) in the case of the conventional apparatus C. This shows that the crystals obtained with the conventional apparatus C were smaller. The above result was corroborated by observation under the microscope that the crystals of terephthalic acid obtained with the apparatus of the present invention were larger than the crystals of terephthalic acid obtained with the conventional apparatus C (see FIGS. 11 A- 11 B).
  • the crystallization apparatus of the present invention has a liquid spouting device and a temperature difference creation means, so that a high crystallization rate can be attained by controlling the temperature of the temperature difference creation means. Consequently, large crystals can be grown fast. Furthermore, it is also possible to control polymorphism, that is, to obtain crystals with the desired structure from various crystal structures. Also, the apparatus of the present invention can be used as both a cooling crystallization apparatus and a concentration crystallization apparatus, and it is possible to control the crystal form and to grow large crystals.

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  • Crystallography & Structural Chemistry (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
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  • Inorganic Compounds Of Heavy Metals (AREA)
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US20030190271A1 (en) * 2000-09-28 2003-10-09 Hideo Noda Heat transfer device
US20050229841A1 (en) * 2004-04-16 2005-10-20 Redden Robert F Protein temperature evaporation-controlled crystallization device and method thereof

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JP5690484B2 (ja) * 2009-12-11 2015-03-25 日揮株式会社 晶析方法および晶析装置
JP5695831B2 (ja) * 2010-02-10 2015-04-08 関西化学機械製作株式会社 晶析装置
CN103480175B (zh) * 2013-09-24 2015-05-20 荣先奎 熔融结晶器
CZ305172B6 (cs) * 2014-03-28 2015-05-27 Bochemie A.S. Diskontinuální krystalizační jednotka pro výrobu kulovitých krystalů
JP6163457B2 (ja) * 2014-06-12 2017-07-12 日軽産業株式会社 アルミン酸ソーダ含有廃液の廃液処理槽及び廃液処理方法
JP5974055B2 (ja) * 2014-08-27 2016-08-23 株式会社日阪製作所 溶質除去装置を備えた滅菌装置、及び、プレフィルドシリンジの製造方法
CN106115942A (zh) * 2016-07-22 2016-11-16 河北省电力建设调整试验所 一种反渗透浓水诱导结晶软化处理系统
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CN115487538B (zh) * 2022-09-19 2023-09-22 山东华仙浩森生物科技有限公司 甜叶糖苷生产的萃取装置
CN116271935B (zh) * 2023-03-16 2024-02-23 福建省德旭新材料有限公司 一种六氟磷酸钠制备用冷却器
CN117802573B (zh) * 2024-02-29 2024-06-07 苏州优晶半导体科技股份有限公司 一种碳化硅单晶的生长装置及生长方法

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ES2295020T3 (es) 2008-04-16
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KR100593713B1 (ko) 2006-06-28
CA2343255C (en) 2007-05-01
CN1148247C (zh) 2004-05-05
NO330038B1 (no) 2011-02-07
WO2001014037A1 (fr) 2001-03-01
CZ20011454A3 (cs) 2001-12-12
US20010011520A1 (en) 2001-08-09
IL142014A0 (en) 2002-03-10
EP1214961A4 (en) 2003-01-29
DK1214961T3 (da) 2008-04-07
AU3837700A (en) 2001-03-19
NO20014283L (no) 2001-09-04
AU765524B2 (en) 2003-09-18
CA2343255A1 (en) 2001-03-01
KR20010075300A (ko) 2001-08-09
CN1327395A (zh) 2001-12-19
CZ303247B6 (cs) 2012-06-20
DE60037256T2 (de) 2008-12-04
DE60037256D1 (de) 2008-01-10
JP3525126B2 (ja) 2004-05-10
TWI240772B (en) 2005-10-01
NO20014283D0 (no) 2001-09-04
IL142014A (en) 2004-09-27

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